Cement mass



I06. COMPOSITIONS, I

COATING OR PLASTIC.

9 Patented Sept. 27, 1938 UNITED STATES PATENT OFFICE CEMENT MASS Karl Daimler and Heinz Thron, Frankfort-onthe Main, Germany, assignors to I. G. Farbenindustrie Aktiengesellschaft, Frankfort-onthe-Main, Germany No Drawing. Application June '7, 1935, Serial No. 25,507. In Germany June 15, 1934 The present invention relates to cement masses be conveyed by means of which, when worked up with water, yield particua 1 ion 0 wa er s n larly waterproof concrete and for the treatment An aqueous solution of 50 per cent. strength of which only relatively small quantities of water of dimethyl-dodec l benZyl-ammonium chloride are required. is added to the cement mortar in a quantity of 2 We have found that the miscibility of the ceper cent. of the cement used. If the same proment may be considerably improved and a liquid portion of water is applied as was hitherto reconsistency may be imparted to the mixture quired for mixing concrete for compression, a without increasing the content of water by addliquid magma of concrete is produced owing to ing to the cement masses water-soluble salts of the addition of the ammonium salt. This magaliphatic or aromatic amines containing at least ma is suitable for being cast or poured. For in- 8 carbon atoms. As additional substances of this stance a mortar consisting of 100 parts of Portkind are suitable, for instance, dodecylamineland cement 480 parts of river sand and cc. chloride, ethyl-dodecylamine-acetate, dibutylof water is mixed with 2 cc. of a solution of aniline hydrochloride, dimethyl-dodecyl-benzylper cent. strength of dimeth l-dodec l-benzylammoni ungrloride, furt more e aine pr ammonium chloride and the ml'xtur e l '?strrred pared from tritffanolamine and sodium chlorun 1 1 1S omog'eneous. acetate, moreover the numerous internal salts Instead of dimethyldodeoyl-benzyl-ammonibelonging to the class of betaine, for instance um chloride there may be used with the same the compounds produced from dimethyl-dod advantage the equal quantity of dimethyl-dodeylamine and sodium chloracetate or sodi cyl-ethyl-ammonium chloride. beta-chlorpropionate, the betaine prepared from we claim: dodecylamine, dimethyl dodecyl ammonium- 1. As a. new composition of matter a mixture methyl-sulfate, dimethyl-benzyl-dodecyl-ammonof cement and a betaine of the formula:

5 Claims.

ium chloride, dimethyl-dodecyl-ethyl-ammonium chloride. R \NCH 00 The proportions in which the additional substances may be mixed with the cement vary ac- 0 cording to the molecular weight of the substance; as a rule there is used a quantity from about 0.5 to about 2 per cent of the weight of the cement. The following examples serve to illustrate the invention, but they are not intended to limit it thereto, the parts being by weight, if not stated otherwise:

@Dodecyl-betaine prepared from dimethyldodecyl-amine and sodium chloracetate is diswherein R1 stands for a high molecular alkyl radical and R2 and R3 stand for low molecular alkyl radicals.

2. As a new composition of matter a mixture of cement and a betaine containing at least 8 carbon atoms to the molecule.

3. As a new composition of matter a mixture of cement and a betaine of the formula:

. R solved in a quantity of 1 per mille (calculated upon the entire mixture of concrete) in the RPIF-CHPCO water used for mixing the cement. The magma R, o

of concrete is prepared with this water in the usual manner. For instance there are used for parts of Portland cement and 480 parts of river sand 4'7 cc. of water which contain 0.6 gram of dissolved dode'cyl-be aine. Owing to the addition of the be ame e consistency of the concrete is changed in the sense that whereas a similar concrete mixture made without the addition could only be used as compressed or rammed concrete, the mixture made in the above manner is suitable for casting and pouring or can wherein R1 stands for a radical containing from 12 to 16 carbon atoms, and R2 and R3 stand for a member of the group consisting of CH: and/or 4. As a new composition of matter a mixture of cement and dodecyl betaine.

5. As a new composition of matter a mixture of cement and about 0.5 to about 2 per cent of dodecyl betaine.

KARL DAIMLER. HEINZ THRON. 

